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near-vacuum pressure induced cooling - Page 2

post #11 of 27
Thread Starter 
how about the box fan? can i use that somehow?
    
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post #12 of 27
Someone needs to study physics some more... and listen to advice of members....
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post #13 of 27
Thread Starter 
? i know physics very well (at least for a high schooler)
i aced the physics c exams earlier this week....
although those didnt have fluid dynamics lol so your probably right

what is it that im missing? thats why i asked. i never said it would work...i was asking if it would and why it wouldn't if it wouldn't

what advice am i missing?
    
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post #14 of 27
Thread Starter 
if you mean the text im not gonna read that now! lol i know theres an easier answer than reading through the whole book...
    
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post #15 of 27
If you had a vacuum, your components would have nothing to transfer heat through. This is one reason that as5 is so great. It makes better contact with the cpu and cooler.
    
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post #16 of 27
Quote:
Originally Posted by amd_hardsoftware View Post
? i know physics very well (at least for a high schooler)
i aced the physics c exams earlier this week....
although those didnt have fluid dynamics lol so your probably right
The thing you need to remember is that this is not an ideal gas application. Those problems take place in a bubble and we have a massive amount of extra energy entering the system - which is kinda the point of the system. While the decompression does lower temps - it does it very temporarily. In order to sustain the cooling you need to constantly compress and decompress the gas - which is basically phase change cooling (except with differing phases rather than pressures)

Good though - but the principle is already in use
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post #17 of 27
rabidgnome phase change isn't quite compressing and decompressing the gas in the same area. there is a seperate area that gets compressed from the stuff that gets expanded. so for that to work he would have to have two chambers and even then I think air wouldn't make the most efficient use.


amd_hardsoftware what type of fan are you proposing to use to create this low pressure?


Quote:
Originally Posted by kennymester View Post
Honestly I don't think that any case can be perfectly seal a vacum. The fans however will not break becuase of that becuase even with the most powerful computer fans you couldn't make a perfect vacum. From experiece though having negative pressure is the best way to get rid of heat.
are you sure "negative pressure" is the best way to remove heat? how did you create this "negative pressure". any proof on this and that it was caused by low pressure?
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post #18 of 27
I'm not saying that it does and don't know where you're getting that. I'm just saying that the principle he's getting at here is employed in phase cooling. Phase cooling works on the fact that when a material changes phase (or in the case of gas pressure) that it absorbs energy (in this case the energy output by the CPU)

BTW - negative pressure does not literally mean P<0, it means that the case's pressure is lower than the surrounding air's pressure due to more airflow out than in
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post #19 of 27
understood the negative pressure as meaning pressure drop rather then true vacuum or true negative pressure. but still am curious what would be used to create a decent enough pressure drop to make a difference.



understood your idea also with the phase change. it was more directed at the wording. the way i read it at least (could be wrong) made it sound like if you compressed then expanded the air in the same area that it would lead to cooling effects.
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post #20 of 27
I was not suggesting that - just trying to link his idea more firmly to phase. Either way - lets just let the thread die
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